GM warranty extension N252503850
What it saysCertain vehicles listed above may have a condition that could cause the mounting bracket on the front exhaust pipe to separate from the pipe. NHTSA’s full summary ↓
GM filed this with NHTSA as a warranty extension dated Jun 10, 2025, about the engine. It names 2 model years across Chevrolet and Buick (2023). A warranty extension is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · Buick.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
Special Coverage. Certain vehicles listed above may have a condition that could cause the mounting bracket on the front exhaust pipe to separate from the pipe. If this condition occurs, a hole may develop in the exhaust pipe at the bracket location, and a rattling or increased exhaust noise may be heard. This special coverage covers the condition described above for a period of 15 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after June 10, 2025, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to June 10, 2025, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to replace the front exhaust pipe as necessary. The repairs will be made at no charge to the customer.
One of the 432 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N252503850 | Warranty extension | Jun 10, 2025 | 11019411 | PDF, 237 KB |
What the document itself lists
The manufacturer titles it “N252503850 - Special Coverage”.
Parts the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 85542639 | Exhaust Front Intermediate Pipe | — |
| 84135650 | Catalytic Converter to Front Exhaust Pipe Gasket | — |
| 23161602 | Exhaust System Intermediate Gasket | — |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 9900933 | Customer Reimbursement Approved - For USA and Canada dealers only - For Export… | 0.2 hrs |
| 9900934 | Customer Reimbursement Denied – For USA dealers only N/A ZREG ** For USA and Canada… | 20 hrs |
Read by machine from the document NHTSA serves (6 pages), read Sep 30, 2026. A part number is shown only where it matches GM’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote.
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themChevrolet 1 model year
Buick 1 model year
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 2 model years this bulletin names have filed 117 complaints with NHTSA since 2015. 24 of them name Engine — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The contact owns a 2023 Buick Enclave. The contact stated that the vehicle was purchased brand new in May. The contact stated while driving 35 MPH, the message "Oil Needed" was displayed. The contact stated that she drove to her destination and then drove back to the residence. The vehicle was towed to the dealer to be diagnosed.
2023 Buick Enclave · Engine · filed with NHTSA Aug 29, 2023 · ODI 11541389
Vehicle shut down and stopped suddenly while driving. Twice this happened. Both times were under 20 miles per hour. Once at a railroad crossing and the other was turning onto a major roadway. Dealership can not locate the problem
2023 Chevrolet Traverse · Engine · filed with NHTSA Jul 25, 2024 · ODI 11604415
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the engine
Source: same model, same component group62 other manufacturer communications filed against these GM models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N262546590-01 | Service campaign | Jul 15, 2026 | Certain vehicles listed above, may have a condition where coolant leaks from the radiator hose quick connect at the radiator inlet. This sp… |
| N252540910 | Service campaign | Feb 25, 2026 | Service Update. Certain vehicles listed above may have a condition in which a quality issue with the engine was identified. Dealers will re… |
| 00-06-01-026R | Service bulletin | Jun 5, 2025 | This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage. |
| 25-NA-132 | Service bulletin | May 17, 2025 | This bulletin provides a procedure to verify a noise and replace the oil pump shaft assembly if the gears of the pump and balance shaft are… |
| 24-NA-201 | Service bulletin | May 16, 2025 | This bulletin provides a procedure to replace the oil pump due to a loose drive pump gear not pressed on the pump shaft. |
| 23-NA-153 | Service bulletin | May 15, 2025 | The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is… |
| 25-NA-113 | Service bulletin | May 9, 2025 | This bulletin provides a procedure to locate and repair a possible cooler galley plug if found the cause of the customers concern of an oil… |
| 25-NA-102 | Service bulletin | May 9, 2025 | This bulletin provides a procedure to inspect and repair a possible rocker arm may have not been installed correctly during assembly. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet and Buick, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM N252503850 a recall?
No. A warranty extension is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the N252503850 repair free?
A warranty extension is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does N252503850 cover?
The manufacturer filed it against 2 model years across 2 brands (Chevrolet and Buick): 2023 Buick Enclave, 2023 Chevrolet Traverse. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.